هاي التجربة كانت جديدة علينا، وبالنهاية صارت النتيجة واضحة.

Yes. هاي is the Levantine way to say this for a feminine singular noun.

Here it points to التجربة (the experiment / the experience), which is feminine, so هاي matches it.

A few useful comparisons:

• هاي التجربة = this experiment/experience
• masculine versions in Levantine are often هاد or هيدا, depending on the region
• in Modern Standard Arabic, you would usually see هذه

So هاي is one of the everyday spoken Levantine forms.

Because تجربة is a feminine noun in Arabic. One big clue is the ending ـة.

Since it is feminine, words connected to it also become feminine:

• كانت = feminine singular was
• جديدة = feminine singular new

So the grammar is agreeing with التجربة.

كانت is the past tense of كان (to be / was), and it changes for gender.

Because التجربة is feminine singular, the sentence uses:

• كانت = she/it was for a feminine noun

So:

• التجربة كانت جديدة = the experiment/experience was new

If the noun were masculine, you would use كان instead.

Because both are adjectives describing feminine singular nouns:

• جديدة describes التجربة
• واضحة describes النتيجة

In Arabic, adjectives usually agree with the noun in:

• gender
• number
• definiteness

So the feminine ending ـة is exactly what you expect here.

علينا is made of:

• على = on
• نا = us

So literally it means on us, but that is not how you should understand it in English here.

In Levantine Arabic, جديد عليّ / علينا is a very common idiomatic way to say:

• new to me
• new to us
• unfamiliar to me/us

So:

• جديدة علينا = new to us

This is a normal Arabic pattern, even though the preposition does not match English.

Sometimes learners hear both patterns, but in this sentence جديدة علينا is the more natural choice for new to us in the sense of unfamiliar or something we had not dealt with before.

إلنا usually means for us or belonging to us, depending on context.

So:

• جديدة علينا = more like unfamiliar/new to us
• جديدة إلنا might sound less natural here, or shift the nuance

For this sentence, علينا is the idiomatic choice.

وبالنهاية is a group of small parts attached together:

• و = and
• بـ = in
• النهاية = the end

So together it means:

• and in the end
• and eventually
• and finally

Arabic often attaches short words like و and بـ directly to the next word, so it is normal to see them written together.

This is a very important nuance.

صار / صارت often means:

• became
• ended up
• came to be

So:

• صارت النتيجة واضحة = the result became clear / ended up clear

This suggests a change or development over time.

If you used كانت النتيجة واضحة, that would simply mean:

• the result was clear

That version sounds more static.
صارت is better here because it shows that clarity came at the end.

Both are possible.

The version in your sentence starts with the verb:

• صارت النتيجة واضحة

This is a very normal Arabic word order, especially in narrative style.

If you say:

• النتيجة صارت واضحة

that is also correct, but it puts a little more focus on the result as the topic.

So the difference is not about right vs. wrong. It is mostly about style and emphasis.

The verb صار can sometimes mean happened in some contexts, but here it clearly means became or ended up being.

Why?

Because it is followed by:

• النتيجة = the subject
• واضحة = an adjective describing the subject

So the structure is:

• صارت النتيجة واضحة = the result became clear

Not:

• the result happened clear

That would not make sense.

A broad Levantine-style pronunciation would be something like:

haay it-tijrbe kaanet jdiideh ʿaleena, w bin-nihaaye Saarit in-natiije waaDeHah

A few notes:

• هاي sounds like haay
• التجربة is often pronounced closer to it-tijrbe or et-tijrbe
• كانت is often kaanet
• جديدة is often jdiide
• بالنهاية is often bin-nihaaye or bil-nihaaye, depending on speaker and region
• صارت is Saarit
• النتيجة is often in-natiije
• واضحة is waaDeHah or in fast speech something closer to waaDHa

Pronunciation varies across the Levant, but those are common spoken patterns.

The sentence is very close to Standard Arabic in structure, but some words are clearly colloquial.

Levantine-style parts:

• هاي instead of Standard هذه
• pronunciation would also be more colloquial than the spelling suggests

A more Standard-style version might look like:

• هذه التجربة كانت جديدة علينا، وفي النهاية أصبحت النتيجة واضحة.

Main differences:

• هاي → هذه
• وبالنهاية → وفي النهاية
• صارت → أصبحت in more formal Arabic

So the original sentence is very natural spoken Levantine, while the Standard version sounds more formal and written.